15 x 4 ) 5 x 6 )= 2 x 9 July 8, 2019 16 32 64 128 15 x 4 )+ 5 x 6 )= 2 x 9 15 x 4 )- 2 x 9 )+ 5 x 6 )= 0 15 6 x 5 15 x 6 =
